The Kunena team has announce the arrival of Kunena 5.1.12.1 [K 5.1.12.1] which is now available for download as a native Joomla extension for J! 3.9.x. This version addresses most of the issues that were discovered in K 5.1 and issues discovered during the development stages of K 5.1. This is a security release.

Solved
Global RSS feed not working

I tried out the global RSS feed on the bottom of the index page. But it doesn't contain any items. Am I doing something wrong or is it a known bug? I tried different settings like By Topic and By Post and different feed formats, e.g. RSS 2.0 and Atom 1.0. They all show up empty.

I indeed excluded two categories in the configuration as a precaution. These are categories with restricted access. If that would exclude them from the RSS feed anyway, then I can do without any exclusions and rely on the board/category permissions instead. Most of our boards/categories are publicly accessible. I just couldn't find any documentation regarding the behavior of RSS feeds with respect to restricted areas. So, I played it rather safe then sorry.

I'm using Thunderbird to test these RSS feeds. I enter the URL and Thunderbird gets the contents of the feed for me. There is no authentication. Thunderbird is not very sophisticated. Which is fine. It's not rocket science, just a news feed.

So, in fact, I'm never logged in from Thunderbird's point of view. If that means the global feed1 will work only for the publicly accessible boards, I'm totally happy. For restricted boards I can still choose to subscribe.

I've added a public category feed for tests in Thunderbird. Afterwards I've forbidden the same category for public and allowed only for certain users. As you can see on the image, the category feed to look pale now and you get no feed anymore.
And the global feed (is the first feed on the image) contain this category also not.

rich wrote: I found the cause and it's a bug. If you exclude a category in the configuration, it excludes all categories in the global feed. I will add it in the bug list.

Sorry, it was a mistake by me, there is not a bug. If you want exclude a category, you must enter the ID and not the name of the category.
But that had nothing to do with our further discussion. I just want to inform you, that this option contain not a bug.